cs4.setName("TotalAmount");
cs4.setExpression("dataSetRow[\"QUANTITYORDERED\"]");
cs4.setDataType("Integer");
cs4.setAggregateFunction("SUM");
computedSet.addItem(cs4);
cs5.setName("GroupTotalAmount");
cs5.setExpression("dataSetRow[\"QUANTITYORDERED\"]");
cs5.setDataType("Integer");
cs5.setAggregateOn("MyGroup");